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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Schedule of Maturities of Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS [Abstract] |  |  |  |
Due within one year, Amortized cost | $ 22,547 |  | $ 22,772 |
Due within two to five years, Amortized cost | 127,576 |  | 138,894 |
Due after five years, Amortized cost | 39,420 |  | 26,053 |
Due within one year, Estimated fair value | 22,637 |  | 22,800 |
Due within two to five years, Estimated fair value | 126,510 |  | 139,210 |
Due after five years, Estimated fair value | 40,145 |  | 26,176 |
Amortized cost | 189,543 | [1] | 187,719 | [2]
Estimated fair value | $ 189,292 |  | $ 188,186 |
[1] | Excluding accrued interest of $776.
[2] | Excluding accrued interest of $781.

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